Permanent hardness of water is due to the presence of
1) Calcium bicarbonate
2) Magnesium bicarbonate
3) Calcium sulphate
4) Sodium bicarbonate

Question

Permanent hardness of water is due to the presence of 
1) Calcium bicarbonate 
2) Magnesium bicarbonate 
3) Calcium sulphate 
4) Sodium bicarbonate

Rohan · Answer

3) Calcium sulphate

(Chlorides, Nitrates, Sulphates of Calcium and Magnesium)

Anil Kumar · Answer

1)calcium bicarbonate

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